Journal of Medical PhysicsThis is an RSS file. You can use it to subscribe to this data in your favourite RSS reader, such as GoogleReader, or to display this data on your own website or blog. Subscribe to this data using MyMedWorm.Subscribe to this data using GoogleReader.Subscribe to this data using Bloglines.Subscribe to this data using MyYahoo.

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GaneshTJournal of Medical Physics 2009 34(4):227-229 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - September 29, 2009 Category: Physics Authors: GaneshT Source Type: journals

Topicsinacceleratorhealthphysics:HPSprofessionaldevelopmentschoolproceedingsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
MackenzieMarcJournal of Medical Physics 2009 34(4):226-226 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - September 29, 2009 Category: Physics Authors: MackenzieMarc Source Type: journals

SimpletechniqueforfabricationofshieldingblocksfortotalbodyirradiationatextendedtreatmentdistancesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
RavichandranR,BinukumarJP,DavisCA,ZahidAM,RajanBJournal of Medical Physics 2009 34(4):223-225Techniquesarebeingstandardizedinourdepartmentfortotalbodyirradiation(TBI)withsixMVphotonsinlinearacceleratorforpreconditioningtobonemarrowtransplantation(BMT).Individualizedshieldswithlowmeltingpointalloyaretobefabricatedforshieldingcriticalorganssuchaslungs,kidneysetc.Amethodtomountdiminisheddimensionofshieldsinatrayat3.75misdesignedinthedepartmentforateletreatmentdistanceoffourmeterswithmagnafieldwithAsimulatorimagetakenwiththepatient'smidplane(MP)atonemeterdistanceisusedtomarkthedimensionsoflung,scaleddownbyafactorof3.75/...
Source: Journal of Medical Physics - September 29, 2009 Category: Physics Authors: RavichandranR,BinukumarJP,DavisCA,ZahidAM,RajanB Source Type: journals

Comparisonofradiationdosesusingweight-basedprotocolanddosemodulationtechniquesforpatientsundergoingbiphasicabdominalcomputedtomographyexaminationsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
LivingstoneRoshanS,DinakaranPaulM,CherianRekhaS,EapenAnuJournal of Medical Physics 2009 34(4):217-222Computedtomography(CT)oftheabdomencontributesasubstantialamountofman-maderadiationdosetopatientsanduseofthismodalityisontheincrease.Thisstudyintendstocompareradiationdoseandimagequalityusingdosemodulationtechniquesandweight-basedprotocolexposureparametersforbiphasicabdominalCT.Usingasix-sliceCTscanner,aprospectivestudyof426patientswhounderwentabdominalCTexaminationswasperformed.Constanttubepotentialsof90kVand120kVwereusedforallarterialandportalvenousphaserespectively.Thetubecurrent-timeproductforweight-basedprotocolwasoptim...
Source: Journal of Medical Physics - September 29, 2009 Category: Physics Authors: LivingstoneRoshanS,DinakaranPaulM,CherianRekhaS,EapenAnu Source Type: journals

MonteCarlosimulationstudiesonscintillationdetectorsandimagereconstructionofbrain-phantomtumorsinTOFPETEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
MondalNagendraNathJournal of Medical Physics 2009 34(4):212-216ThisstudypresentsMonteCarloSimulation(MCS)resultsofdetectionefficiencies,spatialresolutionsandresolvingpowersofatime-of-flight(TOF)PETdetectorsystems.CeriumactivatedLutetiumOxyorthosilicate(Lu2SiO5:CeinshortLSO),BariumFluoride(BaF2)andBriLanCe380(CeriumdopedLanthanumtri-Bromide,inshortLaBr3)scintillationcrystalsarestudiedinviewoftheirgoodtimeandenergyresolutionsandshorterdecaytimes.TheresultsofMCSbasedonGEANTshowthatspatialresolution,detectionefficiencyandresolvingpowero...
Source: Journal of Medical Physics - September 29, 2009 Category: Physics Authors: MondalNagendraNath Source Type: journals

RadiobiologicalmodelingofinterplaybetweenacceleratedrepopulationandalteredfractionationschedulesinheadandneckcancerEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
MarcuLoredanaG,BezakEvaJournal of Medical Physics 2009 34(4):206-211Headandneckcancerrepresentsachallengeforradiationoncologistsduetoacceleratedrepopulationofcancercellsduringtreatment.Thisstudyaimstosimulate,usingMonteCarlomethods,theresponseofavirtualheadandnecktumortobothconventionalandalteredfractionationschedulesinradiotherapywhenacceleratedrepopulationisconsidered.Althoughclinicaltrialsareindispensableforevaluationofnoveltherapeutictechniques,theyaretime-consumingprocesseswhichinvolvemanycomplexandvariablefactorsforsuccess.Modelscanovercomesomeofthelimitationsencounteredbytrialsastheyareabletosimulateinlesscomplexenv...
Source: Journal of Medical Physics - September 29, 2009 Category: Physics Authors: MarcuLoredanaG,BezakEva Source Type: journals

Differentintensityextensionmethodsandtheirimpactonentrancedoseinbreastradiotherapy:AstudyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
SankarA,VelmuruganJJournal of Medical Physics 2009 34(4):200-205Inbreastradiotherapy,skinflashingoftreatmentfieldsisimportanttoaccountforintrafractionmovementsandsetuperrors.Thisstudycomparesthetwodifferentintensityextensionmethods,namely,VirtualBolusmethodandskinflashtoolmethod,toprovideskinflashinginintensitymodulatedtreatmentfields.Theimpactofthesetwodifferentintensityextensionmethodsonskindosewasstudiedbymeasuringtheentrancedoseofthetreatmentfieldsusingsemiconductordiodedetectors.Wefoundnosignificantdifferenceinentrancedoseduetodifferentmethodsusedforintensityextension.However,intheskinflashtoolmethod,selectionofapprop...
Source: Journal of Medical Physics - September 29, 2009 Category: Physics Authors: SankarA,VelmuruganJ Source Type: journals

CommissioningexperienceandqualityassuranceofhelicaltomotherapymachinesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
SenAmarjit,WestMatthewKJournal of Medical Physics 2009 34(4):194-199Ahelicaltomotherapymachinecombinesastraight6MVlinearacceleratormountedonaringgantrywithCTtechnologyforimage-guidedintensity-modulatedradiationtherapy(IMRT)treatment.Afanbeamcreatedbythecollimatorandjawsproducesamaximumof40Χ5cm2fieldsizeattheisocenter.Thegantryandhencethefanbeamrotatesataconstantspeedwhilethecouchmoveslinearlyintothegantrybore,thusproducingahelicaldelivery.Thebeamismodulatedbya64-leafbinarymultileafcollimator(MLC),whichenablesIMRTtreatment.Thelinaccanbeoperatedatalowervoltage(3.5MV)anddoseratetoproducemegavol...
Source: Journal of Medical Physics - September 29, 2009 Category: Physics Authors: SenAmarjit,WestMatthewK Source Type: journals

UseofCesium-131radioactiveseedsinprostatepermanentimplantsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
KehwarTSJournal of Medical Physics 2009 34(4):191-193 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - September 29, 2009 Category: Physics Authors: KehwarTS Source Type: journals

OptimizationofbeamanglesforintensitymodulatedradiationtherapytreatmentplanningusinggeneticalgorithmonadistributedcomputingplatformEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
NazarethDarylP,BrunnerStephen,JonesMatthewD,MalhotraHarishK,BakhtiariMohammadJournal of Medical Physics 2009 34(3):129-132Planningintensitymodulatedradiationtherapy(IMRT)treatmentinvolvesselectionofseveralangleparametersaswellasspecificationofstructuresandconstraintsemployedintheoptimizationprocess.Includingtheseparametersinthecombinatorialsearchspacevastlyincreasesthecomputationalburden,andthereforetheparameterselectionisnormallyperformedmanuallybyaclinician,basedonclinicalexperience.Wehaveinvestigatedtheuseofageneticalgorithm(GA)anddistributed-computingplatformtooptimizethegantryangleparametersandprovideinsightintoadditi...
Source: Journal of Medical Physics - August 10, 2009 Category: Physics Authors: NazarethDarylP,BrunnerStephen,JonesMatthewD,MalhotraHarishK,BakhtiariMohammad Source Type: journals

AdvancesinmultimodalitymolecularimagingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
ZaidiHabib,PrasadRameshwarJournal of Medical Physics 2009 34(3):122-128Multimodalitymolecularimagingusinghighresolutionpositronemissiontomography(PET)combinedwithothermodalitiesisnowplayingapivotalroleinbasicandclinicalresearch.TheintroductionofcombinedPET/CTsystemsinclinicalsettinghasrevolutionizedthepracticeofdiagnosticimaging.Thecomplementaritybetweentheintrinsicallyalignedanatomic(CT)andfunctionalormetabolic(PET)informationprovidedina"one-stopshop"andthepossibilitytouseCTimagesforattenuationcorrectionofthePETdatahasbeenthedrivingforcebehindthesuccessofthistechnology.Ontheotherhand,combiningPETwithMagn...
Source: Journal of Medical Physics - August 10, 2009 Category: Physics Authors: ZaidiHabib,PrasadRameshwar Source Type: journals

Radiation-basedquantitativebioimagingatthenationalinstituteofstandardsandtechnologyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
KaramLisaRJournal of Medical Physics 2009 34(3):117-121Buildingonalonghistoryofprovidingphysicalmeasurementsandstandardsformedicalxraysandnuclearmedicineradionuclides,thelaboratoryhasexpandeditsfocustobettersupporttheextensiveuseofmedicalphysicsintheUnitedStatestoday,providingconfidenceinkeyresultsneededfordruganddevicedevelopmentandmarketing,therapyplanningandefficacyanddiseasescreening.Inparticular,tosupportmorequantitativemedicalimaging,thislaboratoryhasimplementedaprogramtoprovidekeymeasurementinfrastructuretosupportradiation-basedimagingthroughdevelopingstandard,benchmarkphantoms,whichcontainradioactivesourcescalibrat...
Source: Journal of Medical Physics - August 10, 2009 Category: Physics Authors: KaramLisaR Source Type: journals

AdvancesinradiationtherapydosimetryEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PaliwalBhudatt,TewatiaDineshJournal of Medical Physics 2009 34(3):108-116Duringthelastdecade,therehasbeenanexplosionofnewradiationtherapyplanninganddeliverytools.Wewentthrougharapidtransitionfromconventionalthree-dimensional(3D)conformalradiationtherapytointensity-modulatedradiationtherapy(IMRT)treatments,andadditionalnewtechniquesformotion-adaptiveradiationtherapyarebeingintroduced.Theseadvancespushthefrontiersinourefforttoprovidebetterpatientcare;andwiththeadditionofIMRT,temporaldimensionsaremajorchallengesfortheradiotherapypatientdosimetryanddeliveryverification.Advancedtechniquesarelesstoleranttopoorimplementationthana...
Source: Journal of Medical Physics - August 10, 2009 Category: Physics Authors: PaliwalBhudatt,TewatiaDinesh Source Type: journals

PrefacetotheSpecialIssueEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
PradhanASJournal of Medical Physics 2009 34(3):107-107 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - August 10, 2009 Category: Physics Authors: PradhanAS Source Type: journals

Optimization of beam angles for intensity modulated radiation therapy treatment planning using genetic algorithm on a distributed computing platformEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Nazareth Daryl P, Brunner Stephen, Jones Matthew D, Malhotra Harish K, Bakhtiari MohammadJournal of Medical Physics 2009 34(3):129-132Planning intensity modulated radiation therapy (IMRT) treatment involves selection of several angle parameters as well as specification of structures and constraints employed in the optimization process. Including these parameters in the combinatorial search space vastly increases the computational burden, and therefore the parameter selection is normally performed manually by a clinician, based on clinical experience. We have investigated the use of a genetic algorithm (GA) and distributed-...
Source: Journal of Medical Physics - August 4, 2009 Category: Physics Authors: Nazareth Daryl P, Brunner Stephen, Jones Matthew D, Malhotra Harish K, Bakhtiari Mohammad Source Type: journals

Advances in multimodality molecular imagingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Zaidi Habib, Prasad RameshwarJournal of Medical Physics 2009 34(3):122-128Multimodality molecular imaging using high resolution positron emission tomography (PET) combined with other modalities is now playing a pivotal role in basic and clinical research. The introduction of combined PET/CT systems in clinical setting has revolutionized the practice of diagnostic imaging. The complementarity between the intrinsically aligned anatomic (CT) and functional or metabolic (PET) information provided in a &quot;one-stop shop&quot; and the possibility to use CT images for attenuation correction of the PET data...
Source: Journal of Medical Physics - August 4, 2009 Category: Physics Authors: Zaidi Habib, Prasad Rameshwar Source Type: journals

Radiation-based quantitative bioimaging at the national institute of standards and technologyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Karam Lisa RJournal of Medical Physics 2009 34(3):117-121Building on a long history of providing physical measurements and standards for medical x rays and nuclear medicine radionuclides, the laboratory has expanded its focus to better support the extensive use of medical physics in the United States today, providing confidence in key results needed for drug and device development and marketing, therapy planning and efficacy and disease screening. In particular, to support more quantitative medical imaging, this laboratory has implemented a program to provide key measurement infrastructure to support radiation-based imagin...
Source: Journal of Medical Physics - August 4, 2009 Category: Physics Authors: Karam Lisa R Source Type: journals

Advances in radiation therapy dosimetryEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Paliwal Bhudatt, Tewatia DineshJournal of Medical Physics 2009 34(3):108-116During the last decade, there has been an explosion of new radiation therapy planning and delivery tools. We went through a rapid transition from conventional three-dimensional (3D) conformal radiation therapy to intensity-modulated radiation therapy (IMRT) treatments, and additional new techniques for motion-adaptive radiation therapy are being introduced. These advances push the frontiers in our effort to provide better patient care; and with the addition of IMRT, temporal dimensions are major challenges for the radiotherapy patient dosimetry and...
Source: Journal of Medical Physics - August 4, 2009 Category: Physics Authors: Paliwal Bhudatt, Tewatia Dinesh Source Type: journals

Preface to the Special IssueEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Pradhan A SJournal of Medical Physics 2009 34(3):107-107 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - August 4, 2009 Category: Physics Authors: Pradhan A S Source Type: journals

A quantitative analysis of the structure of human sternumEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Arbabi AzimJournal of Medical Physics 2009 34(2):80-86An extensive study of the human sternum has been carried out to obtain estimates of the omnidirectional path-length distributions and structural parameters for trabeculation and marrow spaces. Data for sternum samples have been collected, using an object plane scanning microscope. These data have been used to produce the omnidirectional path-length distributions and values of structural parameters for the whole sternum. For a typical adult man the mean trabecular and marrow space path lengths are 224 and 1364 µm, respectively. The percentage bone volume is 13.8 a...
Source: Journal of Medical Physics - June 8, 2009 Category: Physics Authors: Arbabi Azim Source Type: journals

Initial dosimetric experience with mega voltage computed tomography detectors and estimation of pre and post-repair dosimetric parameters of a first helical Hi-Art II tomotherapy machine in IndiaEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Kinhikar Rajesh A, Master Zubin, Dhote Dipak S, Deshpande Deepak DJournal of Medical Physics 2009 34(2):73-79A Helical Tomotherapy TM (HT) Hi-Art II (TomoTherapy, Inc., Madison, WI, USA) has been one of the important innovations to help deliver IMRT with image guidance. On-board, mega voltage computed tomography (MVCT) detectors are used for imaging and dosimetric purpose. The two objectives of this study are: (i) To estimate the dosimetric and general capability (TomoImage registration, reconstruction, contrast and spatial resolution, artifacts-free image and dose in Tomo...
Source: Journal of Medical Physics - June 8, 2009 Category: Physics Authors: Kinhikar Rajesh A, Master Zubin, Dhote Dipak S, Deshpande Deepak D Source Type: journals

Static versus dynamic intensity-modulated radiotherapy: Profile of integral dose in carcinoma of the nasopharynxEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This study is aimed to evaluate the impact of static and dynamic intensity modulated radiotherapy (IMRT) delivery techniques planned with Eclipse TPS on the integral dose to the healthy normal tissue surrounding the tumor-bearing area and to the volume receiving doses <5 Gy in patients with carcinoma nasopharynx treated with Simultaneous Integrated Boost IMRT (SIB-IMRT). Ten patients with carcinoma nasopharynx were chosen for this dosimetric study. IMRT plans were generated with 6X using dynamic multileaf collimator (DMLC) and static multileaf collimator (SMLC) with 5, 10 and 15 intensity levels (L). Integral dos...
Source: Journal of Medical Physics - June 8, 2009 Category: Physics Authors: Jothybasu K S, Bahl Amit, Subramani V, Rath G K, Sharma D N, Julka P K Source Type: journals

Has the time come for doing away with Cobalt-60 teletherapy for cancer treatmentsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Ravichandran RJournal of Medical Physics 2009 34(2):63-65 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 8, 2009 Category: Physics Authors: Ravichandran R Source Type: journals

AcknowledgmentsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Journal of Medical Physics 2009 34(1):59-59 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 29, 2009 Category: Physics Source Type: journals

The Modern Technology of Radiation Oncology - Volumes I (1999) and II (2005)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Suntharalingam NJournal of Medical Physics 2009 34(1):58-58 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 16, 2009 Category: Physics Authors: Suntharalingam N Source Type: journals

Highlights of International Conference on Medical Physics (ICMP- 2008)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Sharma S DJournal of Medical Physics 2009 34(1):55-56 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 16, 2009 Category: Physics Authors: Sharma S D Source Type: journals

News and EventsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Ganesh TJournal of Medical Physics 2009 34(1):52-54 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 16, 2009 Category: Physics Authors: Ganesh T Source Type: journals

Design and development of an inflatable latex balloon to reduce rectal and bladder doses for patients undergoing high dose rate brachytherapyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This article describes the design and development of an inflatable balloon that can be used along with the applicator as a substitute for gauze packing. The balloon has two parts-the bladder part (B-part) and the rectum part (R-part), both of them are independently inflatable. The selection of the material, its width, length, and thickness are described. A mould/former for making the balloon was designed. Polished steel was used as the mould. This was dipped in specially prepared natural rubber latex (NRL) solution several times; the layers were dried and stripped to get the balloon. The composition of NRL and the compound...
Source: Journal of Medical Physics - March 16, 2009 Category: Physics Authors: Raghukumar P, Nair Raghu Ram K, Aprem Abi S, Bhasi Saju, Sisupal Suja, Padmanbhan V Source Type: journals

Infrared thermal imaging for detection of peripheral vascular disordersEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Bagavathiappan S, Saravanan T, Philip John, Jayakumar T, Raj Baldev, Karunanithi R, Panicker T.M.R, Korath M Paul, Jagadeesan KJournal of Medical Physics 2009 34(1):43-47Body temperature is a very useful parameter for diagnosing diseases. There is a definite correlation between body temperature and diseases. We have used Infrared Thermography to study noninvasive diagnosis of peripheral vascular diseases. Temperature gradients are observed in the affected regions of patients with vascular disorders, which indicate abnormal blood flow in the affected region. Thermal imaging results are well correlated with the clinical find...
Source: Journal of Medical Physics - March 16, 2009 Category: Physics Authors: Bagavathiappan S, Saravanan T, Philip John, Jayakumar T, Raj Baldev, Karunanithi R, Panicker T.M.R, Korath M Paul, Jagadeesan K Source Type: journals

Ultrafast bold fMRI using single-shot spin-echo echo planar imagingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Boujraf Said, Summers Paul, Belahsen Faouzi, Prussmann Klaas, Kollias SpyrosJournal of Medical Physics 2009 34(1):37-42The choice of imaging parameters for functional MRI can have an impact on the accuracy of functional localization by affecting the image quality and the degree of blood oxygenation-dependent (BOLD) contrast achieved. By improving sampling efficiency, parallel acquisition techniques such as sensitivity encoding (SENSE) have been used to shorten readout trains in single-shot (SS) echo planar imaging (EPI). This has been applied to susceptibility artifact reduction and improving spatial resolution. SENSE toge...
Source: Journal of Medical Physics - March 16, 2009 Category: Physics Authors: Boujraf Said, Summers Paul, Belahsen Faouzi, Prussmann Klaas, Kollias Spyros Source Type: journals

Extrapolation chamber mounted on perspex for calibration of high energy photon and electron beams from a clinical linear acceleratorEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The objective of the present study is to establish radiation standards for absorbed doses, for clinical high energy linear accelerator beams. In the nonavailability of a cobalt-60 beam for arriving at Nd, water values for thimble chambers, we investigated the efficacy of perspex mounted extrapolation chamber (EC) used earlier for low energy x-rays and beta dosimetry. Extrapolation chamber with facility for achieving variable electrode separations 10.5mm to 0.5mm using micrometer screw was used for calibrations. Photon beams 6 MV and 15 MV and electron beams 6 MeV and 15 MeV from Varian Clinac linacs were calibrated. Absorb...
Source: Journal of Medical Physics - March 16, 2009 Category: Physics Authors: Ravichandran R, Binukumar J P, Sivakumar S S, Krishnamurthy K, Davis C A Source Type: journals

Dosimetric validation of first helical tomotherapy Hi-Art II machine in IndiaEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Kinhikar Rajesh A, Jamema Swamidas V, Reenadevi, Pai Rajeshri, Zubin Master, Gupta Tejpal, Dhote Deepak S, Deshpande Deepak D, Shrivastava Shyam K, Sarin RajivJournal of Medical Physics 2009 34(1):23-30A Helical Tomotherapy (HT) Hi-Art II machine, Hi ART (TomoTherapy, Inc., Madison, WI, USA) was installed at our center in July 2007, and was the first machine in India. Image-guided HT is a new modality for delivering intensity modulated radiotherapy (IMRT). Dosimetric tests done include (a) primary beam alignment (b) secondary beam alignment (c) water tank measurements (profiles and depth doses) (d) dose rate measurements (...
Source: Journal of Medical Physics - March 16, 2009 Category: Physics Authors: Kinhikar Rajesh A, Jamema Swamidas V, Reenadevi, Pai Rajeshri, Zubin Master, Gupta Tejpal, Dhote Deepak S, Deshpande Deepak D, Shrivastava Shyam K, Sarin Rajiv Source Type: journals

Comparative study of convolution, superposition, and fast superposition algorithms in conventional radiotherapy, three-dimensional conformal radiotherapy, and intensity modulated radiotherapy techniques for various sites, done on CMS XIO planning systemEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
According to this study the dosimetric results using different algorithms led to significant variation and therefore care had to be taken while evaluating treatment plans. The choice of a dose calculation algorithm may in certain cases even influence clinical results. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 16, 2009 Category: Physics Authors: Muralidhar K R, Murthy Narayana P, Raju Alluri Krishnam, Sresty NVNM Source Type: journals

Effects of energy spectrum on dose distribution calculations for high energy electron beamsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Toutaoui Abdelkader, Khelassi-Toutaoui Nadia, Brahimi Zakia, Chami Ahmed ChafikJournal of Medical Physics 2009 34(1):4-11In an early work we have demonstrated the possibility of using Monte Carlo generated pencil beams for 3D electron beam dose calculations. However, in this model the electron beam was considered as monoenergetic and the effects of the energy spectrum were taken into account by correction factors, derived from measuring central-axis depth dose curves. In the present model, the electron beam is considered as polyenergetic and the pencil beam distribution of a clinical electron beam, of a given nominal energ...
Source: Journal of Medical Physics - March 16, 2009 Category: Physics Authors: Toutaoui Abdelkader, Khelassi-Toutaoui Nadia, Brahimi Zakia, Chami Ahmed Chafik Source Type: journals

Issues related to the implementation of internship/ residency program for qualified medical radiation physicistsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Sharma S DJournal of Medical Physics 2009 34(1):1-3 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 16, 2009 Category: Physics Authors: Sharma S D Source Type: journals

ObituaryEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Iyer P SJournal of Medical Physics 2008 33(4):178-178 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - December 13, 2008 Category: Physics Authors: Iyer P S Source Type: journals

News and EventsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Ganesh TJournal of Medical Physics 2008 33(4):175-177 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - December 13, 2008 Category: Physics Authors: Ganesh T Source Type: journals

Radiation burden of assistant medical technicians at a medical acceleratorEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Grundel M, Guthoff FJournal of Medical Physics 2008 33(4):171-174A survey of a CLINAC 2100 C medical accelerator showed residual short half-life radiation after switching off the accelerator. This led to a dose of radiation for the medical employees when the patient was handled. The dose rate was measured with a dose rate meter FH40G, and annual dose for an assistant medical technician (AMT) was estimated under conservative conditions. In the assumed situation of 1000 patient treatment fractions with high-energy photons, an AMT would get an annual dose of 960 µSv, while the monthly dosimeter records would show zero,...
Source: Journal of Medical Physics - December 13, 2008 Category: Physics Authors: Grundel M, Guthoff F Source Type: journals

Studies on the time course of apparent diffusion coefficient and signal intensities on T2- and diffusion-weighted MR Imaging in acute cerebral ischemic strokeEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Srivastava Ajai K, Mehrotra Gopesh, Bhargava Satish K, Agarwal Sunil, Tripathi Rajendra PJournal of Medical Physics 2008 33(4):162-170The time course of changes in apparent diffusion coefficient (ADC) and signal intensity on diffusion-weighted magnetic resonance imaging (DW MR) imaging in acute ischemic stroke is a very dynamic event. There is an initial reduction in ADCs with no change on T2-W imaging but signal intensity increase on T2-weighted takes place about 6-12 hours after onset of stroke. As necrosis begins to set in, there is a gradual reversal of ADC change, and around 3-10 days post-onset, ADC pseudonormalizes....
Source: Journal of Medical Physics - December 13, 2008 Category: Physics Authors: Srivastava Ajai K, Mehrotra Gopesh, Bhargava Satish K, Agarwal Sunil, Tripathi Rajendra P Source Type: journals

Testicular shield for para-aortic radiotherapy and estimation of gonad dosesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Ravichandran R, Binukumar J P, Kannadhasan S, Shariff M H, Ghamrawy Kamal ElJournal of Medical Physics 2008 33(4):158-161For radiotherapy of para-aortic and abdominal regions in male patients, gonads are to be protected to receive less than 2% of the prescribed dose. A testicular shield was fabricated for abdominal radiotherapy with 15 MV X-rays ((Clinac 2300 CD, Varian AG) with low melting point alloy (Cerroband). The dimensions of the testicular shield were 6.5 cm diameter and 3.5 cm depth with 1.5 cm wall thickness. During treatment, this shield was held in position by a rectangular sponge and Styrofoam support. ...
Source: Journal of Medical Physics - December 13, 2008 Category: Physics Authors: Ravichandran R, Binukumar J P, Kannadhasan S, Shariff M H, Ghamrawy Kamal El Source Type: journals

Interobserver variation in rectal and bladder doses in orthogonal film-based treatment planning of cancer of the uterine cervixEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This study aims at examining the variation in rectal and bladder doses when the same set of orthogonal films was given to different observers. Five physicists were given 35 pairs of orthogonal films obtained from patients who had undergone HDR brachytherapy. They were given the same instructions and asked to plan the case assuming the tumor was centrally placed, using the treatment-planning system, PLATO BPS V13.2. A statistically significant difference was observed in the average rectal (F = 3.407, P = 0.01) and bladder (F = 3.284, P</i�...
Source: Journal of Medical Physics - December 13, 2008 Category: Physics Authors: Raghukumar P, Nair K Raghu Ram, Saju B, Zhenia G, Divya K T, Shaiju V S, Padmanabhan V Source Type: journals

Magnitude of shift of tumor position as a function of moderated deep inspiration breath-hold: An analysis of pooled data of lung patients with active breath control in image-guided radiotherapyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In conclusion, the moderated deep-inspiration breath-hold method using a spirometer is feasible, with relatively good reproducibility of the tumor position for image-guided radiotherapy in lung cancers. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - December 13, 2008 Category: Physics Authors: Muralidhar K R, Murthy P Narayana, Mahadev D Shanker, Subramanyam K, Sudarshan G, Raju A Krishnam Source Type: journals

In-air fluence profiles and water depth dose for uncollimated electron beamsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Toutaoui Abdelkader, Aichouche Amar Nassim, Adjidir Kenza, Chami Ahmed ChafikJournal of Medical Physics 2008 33(4):141-146Advanced electron beam dose calculation models for radiation treatment planning systems require the input of a phase space beam model to configure a clinical electron beam in a computer. This beam model is a distribution in position, energy, and direction of electrons and photons in a plane in front of the patient. The phase space beam model can be determined by Monte Carlo simulation of the treatment head or from a limited set of measurements. In the latter case, parameters of the electron phase space ...
Source: Journal of Medical Physics - December 13, 2008 Category: Physics Authors: Toutaoui Abdelkader, Aichouche Amar Nassim, Adjidir Kenza, Chami Ahmed Chafik Source Type: journals

Tumor delineation: The weakest link in the search for accuracy in radiotherapyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Njeh C FJournal of Medical Physics 2008 33(4):136-140Radiotherapy is one of the most effective modalities for the treatment of cancer. However, there is a high degree of uncertainty associated with the target volume of most cancer sites. The sources of these uncertainties include, but are not limited to, the motion of the target, patient setup errors, patient movements, and the delineation of the target volume. Recently, many imaging techniques have been introduced to track the motion of tumors. The treatment delivery using these techniques is collectively called image-guided radiation therapy (IGRT). Ultimately, IGRT is o...
Source: Journal of Medical Physics - December 13, 2008 Category: Physics Authors: Njeh C F Source Type: journals

A statement of the rights of scientists and engineersEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Hendee WilliamJournal of Medical Physics 2008 33(4):135-135 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - December 13, 2008 Category: Physics Authors: Hendee William Source Type: journals

Recent developments of optically stimulated luminescence materials and techniques for radiation dosimetry and clinical applicationsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A S Pradhan, J I Lee, J L KimJournal of Medical Physics 2008 33(3):85-99During the last 10 years, optically stimulated luminescence (OSL) has emerged as a formidable competitor not only to thermoluminescence dosimetry (TLD) but also to several other dosimetry systems. Though a large number of materials have been synthesized and studied for OSL, Al 2 O 3 :C continues to dominate the dosimetric applications. Re-investigations of OSL in BeOindicate that this material might provide an alternative to Al...
Source: Journal of Medical Physics - September 11, 2008 Category: Physics Authors: A S Pradhan, J I Lee, J L Kim Source Type: journals

News and EventsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Ganesh TJournal of Medical Physics 2008 33(3):132-134 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - September 4, 2008 Category: Physics Authors: Ganesh T Source Type: journals

The handbook of physics in diagnostic imagingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Govinda Rajan KNJournal of Medical Physics 2008 33(3):130-131 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - September 4, 2008 Category: Physics Authors: Govinda Rajan KN Source Type: journals

A method for estimation of accuracy of dose delivery with dynamic slit windows in medical linear acceleratorsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Ravichandran R, Binukumar JP, Sivakumar SS, Krishnamurthy K, Davis CAJournal of Medical Physics 2008 33(3):127-129Intensity-modulated radiotherapy (IMRT) clinical dose delivery is based on computer-controlled multileaf movements at different velocities. To test the accuracy of modulation of the beam periodically, quality assurance (QA) methods are necessary. Using a cylindrical phantom, dose delivery was checked at a constant geometry for sweeping fields. Repeated measurements with an in-house designed methodology over a period of 1 year indicate that the method is very sensitive to check the proper functioning of such dos...
Source: Journal of Medical Physics - September 4, 2008 Category: Physics Authors: Ravichandran R, Binukumar JP, Sivakumar SS, Krishnamurthy K, Davis CA Source Type: journals

Segmentation and classification of medical images using texture-primitive features: Application of BAM-type artificial neural networkEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The objective of developing this software is to achieve auto-segmentation and tissue characterization. Therefore, the present algorithm has been designed and developed for analysis of medical images based on hybridization of syntactic and statistical approaches, using artificial neural network (ANN). This algorithm performs segmentation and classification as is done in human vision system, which recognizes objects; perceives depth; identifies different textures, curved surfaces, or a surface inclination by texture information and brightness. The analysis of medical image is directly based on four steps: 1) image filtering,...
Source: Journal of Medical Physics - September 4, 2008 Category: Physics Authors: Sharma Neeraj, Ray Amit K, Sharma Shiru, Shukla KK, Pradhan Satyajit, Aggarwal Lalit M Source Type: journals